First Trimester: Sperm and egg unite, Limb buds form, Fetus has a tail, Pregnant woman experiences "morning sickness", Head bulge forms, Fetus is about three inches long, Placenta forms, Second Trimester: Fetus is about 11 inches long, Fetus becomes active, Heartbeat can be heard with a stethoscope, Sex can be determined with a sonogram, Third Trimester: Body systems complete development, Fetus increases dramatically in size and weight, Birth occurs, Fetus is about 20 inches long, Pregnant woman may find movement difficult,

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